Paste or type your text to instantly calculate Flesch, Gunning Fog, SMOG, Coleman-Liau, and more — with actionable clarity insights.
Start typing or paste your content into the text area. All six readability formulas will calculate automatically.
This readability analyser scores any piece of writing against six well-established formulas at once — Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog Index, SMOG Index, Coleman-Liau Index, and the Automated Readability Index (ARI) — then turns the numbers into a single, plain-English picture of how hard your text is to read.
Instead of guessing whether your copy is too dense, you get exact grade levels, a 0–100 ease score, sentence and syllable statistics, and concrete suggestions for what to fix. People use it to:
Everything runs locally and in-browser — your text is analysed entirely on your own device with JavaScript, so nothing is ever uploaded, stored, or logged.
Flesch Reading Ease is a 0–100 scale where higher is easier. It is calculated from average sentence length and average syllables per word. Roughly: 90–100 is very easy (5th grade), 60–70 is plain English understood by most adults, and 0–30 is very difficult, best suited to university graduates.
Flesch-Kincaid Grade Level converts the same sentence-length and syllable data into a US school grade. A score of 8 means an average 8th grader (around age 13) can read the text. It uses the formula 0.39 × (words/sentence) + 11.8 × (syllables/word) − 15.59.
SMOG (Simple Measure of Gobbledygook) estimates the years of education needed to understand a text by counting polysyllabic words (3+ syllables) across the sample. It is widely trusted for healthcare and patient-facing materials because it predicts comprehension reliably for difficult content.
For general web and marketing copy, aim for a Flesch Reading Ease of 60–70, which equals roughly a grade 7–8 reading level. Landing pages and emails can go higher (70–80+), while technical or academic content for specialist audiences may run lower because readers expect it.
Shorten sentences to under 20 words, swap long polysyllabic words for simpler synonyms, use active voice, and break dense paragraphs into shorter ones. Use the Highlight button to find complex and long words, then revise them and re-test until your scores reach the target range.
It calculates six formulas simultaneously: Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog Index, SMOG Index, Coleman-Liau Index, and the Automated Readability Index (ARI). It also shows a consensus grade level that averages the five grade-based scores for a more reliable estimate.
No. Analysis runs entirely in your browser via JavaScript — your content never leaves your device, and nothing is stored, transmitted, or logged.